LTC4357IMS8#TRPBF   电源管理 IC(PMIC) 

LTC4357IMS8#TRPBF 

制造商:	Analog Devices Inc.
产品种类:	zhuan业电源管理 (PMIC)
RoHS:	详细信息
系列:	LTC4357
类型:	Ideal Diode Controller
安装风格:	SMD/SMT
封装 / 箱体:	MSOP-8
输出电流:	80 uA
输入电压范围:	9 V to 80 V
输出电压范围:	9 V to 80 V
zui小工作温度:	- 55 C
zui大工作温度:	%2B 125 C
输入电流:	350 uA
封装:	Reel
封装:	Cut Tape
封装:	MouseReel
商标:	Analog Devices
输入电压（zui大值）:	80 V
输入电压（zui小值）:	9 V
zui大输出电压:	80 V
产品类型:	Power Management Specialized - PMIC
工厂包装数量:	2500
子类别:	PMIC - Power Management ICs
单位重量:	26.376 mg

The LTC4357 controls an external N-channel MOSFET to form an ideal diode. The voltage across the source and drain is monitored by the IN and OUT pins, and the GATE pin drives the MOSFET to control its operation. In effect the MOSFET source and drain serve as the anode and cathode of an ideal diode. At power-up, the load current initially flows through the body diode of the MOSFET. The resulting high forward voltage is detected at the IN and OUT pins, and the LTC4357 drives the GATE pin to servo the forward drop to 25mV. If the load current causes more than 25mV of voltage drop when the MOSFET gate is driven fully on, the forward voltage is equal to RDS(ON) ? ILOAD. If the load current is reduced causing the forward drop to fall below 25mV, the MOSFET gate is driven lower by a weak pull-down in an attempt to maintain the drop at 25mV. If the load current reverses and the voltage across IN to OUT is more negative than –25mV the LTC4357IMS8#TRPBF responds by pulling the MOSFET gate low with a strong pull-down. In the event of a power supply failure, such as if the output of a fully loaded supply is suddenly shorted to ground, reverse current temporarily flows through the MOSFET that is on. This current is sourced from any load capacitance and from the other supplies. The LTC4357IMS8#TRPBF quickly responds to this condition turning off the MOSFET in about 500ns, thus minimizing the disturbance to the output bus.

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